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Doctor insights on:
Sun Exposure

Sun Exposure (Overview)

Sunburn results when the amount of exposure to the sun or other ultraviolet light source exceeds the ability of the body's protective pigment, melanin, to protect the skin. Sunburn in a very light-skinned person may occur in less than 15 minutes of midday sun exposure, while a dark-skinned person may tolerate the same exposure for hours.

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Depends On Skin Type:
Melanoma is the deadliest of all skin cancers. Your risk of melanoma with sun exposure depends on your skin type. Skin that burns easily and never tans has a higher risk of developing melanoma than skin that is dark and almost never burns. As a rule, you should always wear sunscreen when exposed to the sun. Not only will that decrease your risk of melanoma, it also prevents premature aging.
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Sun Exposure (Overview)

Sunburn results when the amount of exposure to the sun or other ultraviolet light source exceeds the ability of the body's protective pigment, melanin, to protect the skin. Sunburn in a very light-skinned person may occur in less than 15 minutes of midday sun exposure, while a dark-skinned person may tolerate the same exposure for hours.

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Here are some ...:
Since Fordyce's spots are ectopic sebaceous glands beneath the skin, sunlight would not grow their size, but of course, as expected, the overlying skin may darken leading to potential deceptive look, which you may like them. So, no effect and no harm from Fordyce's spots. More? Seek pro-evaluation & counseling preferably from dermatologist timely. Best wishes...
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Any sun exposure:
Has some carcinogenic potential related to UV exposure. But remember its exceptionally small with limited exposure like you mention. There are many benefits to sun exposure too, you level of exposure just needs to be balanced based on your risk for developing skin cancer.
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Sunlight(UV) & aging:
A study published in 2013 showed that UV ray account for a whopping 80% of skin aging , including wrinkles. Remember that it is not sunlight but "light" and the UVA, UVB and IR radiation that is the culprit. This is the reason that DAILY application of a broad spectrum, antioxidantsunscreen is a critical step in maintaining youthful, healthy skin, whether it is sunny, cloudy or overcast.
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Physical sunblock:
The use of a good quality physical sun block that blocks out both UV A and UVB rays. The skin will still tan but to a much lesser extent. The physical block should be either zinc or titanium . Theses products can be purchased at a dermatologist office and in many spas. The better products are PCA, Skin Medica, SkinCeuticals, Obagi and others but these are most popular
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Yes:
You should always protect yourself from sun-exposure whether you have permenant make-up or not. The pigments will fade somewhat faster from the sun exposure so make sure you use either a lip balm or lotion for your face over the areas to protect from the sun.
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Don't look for cause:
Acne is unrelated to hygiene or lifestyle and only marginally to diet. Don't try to figure out the cause, but manage your illness until it self-cures with age. If topical benzoyl peroxide has not cleared you in 2 weeks, get with your personal physician who can add prescription-strength rx.
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Porphyria:
There is a rare disorder of blood products called porphyria it was the basis for several horror movies in the old days such as the wolf man because these patients can not tolerate sun light and often have an abundance of body hair.
There are several variants that make sun exposure more harmful than others.
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